I’m aware of this and also planning on addressing it. One of the reasons that people associate the long term future with x-risk reduction is that the major EA organizations that have embraced the long term future thesis (80,000 Hours, Open Phil etc.) all consider biosecurity to be important. If your primary focus is on s-risks, you would not put much effort into biorisk reduction. (See here and here.)
I agree the long-term value thesis and the aim of reducing extinction risk often go together, but I think it would be better if we separated them conceptually.
At 80k we’re also concerned that there might be better ways to help the future, which is one reason why we highly prioritise global priorities research.